A Beaumont resident who teaches at El Monte High School was arrested Tuesday on suspicion of sexually assaulting a girl.

Beaumont and El Monte police officers arrested Miguel Lazo, 60, at El Monte High School, 3048 Tyler Avenue, at 8:15 a.m., authorities said. He was booked at a Los Angeles County Jail on a felony charge of lewd and lascivious acts with a minor under 14, but was released by 1:30 p.m. after posting $55,000 bail, according to online county jail records.

The investigation began in February 2018 when an 8-year-old girl reported to authorities that she had been sexually assaulted by a family member in Beaumont, said Marcedes Cashmer, spokeswoman for the Beaumont Police Department. The girl, along with parents, had gone to a Beaumont hospital emergency room to report the incident. Beaumont police were notified and began to investigate.

Investigators believe the girl was assaulted in Lazo’s Beaumont home, Cashmer said. The girl and Lazo are relatives, but the specific relation was not released.

Though Lazo is a teacher at El Monte High School, authorities said there is no relation between the alleged incident and his job.

El Monte Union High School District officials were not immediately available for comment.